| In order to study the accumulative characters of spring wheat types with different level of yield and quality in different times during the development. The experiment determining the agricultural traits and materials weight dynamic of spike, stem and plant after flowering by the split-plot design with 4 densities as the main treatment and 10 spring wheat cultivars(or lines) as secondary treantment. Some agronomic traits, quality, yield and yield components of the cultivars(or lines) were observed. The result were summarized as follows:The 10 cultivars(lines ) were devided into 3 groups in terms of high, middle and low yield types respectively by their levels of yield and 3 groups in terms of high, middle and low gluten types by their levels of quality, of which the yield of the line DONG 01-4489 was the best of cultivars (or lines) under 4 densities and its average yield per 667m2 was above 500kg and its highest yield was 572.75kg per 667m2 under 6 million seedings per hectare. The yield of Dong 01-4489 reached to the high yield of wheat in Hei Long Jiang province. At the same time the quality of DONG 01-4489 was belonged to the high gluten type. The average quality level of DONG 01-4489 under four density was 18.44% in protein, 47.47ml in SDS-sedimentation, 44.03% in wet gluten, 16.77% in dry gluten, 314.33s in falling number.By comparison with agricultural traits of the high, middle, low yield types, the kernel number of ear was found to be the restricting factor of high yield of whaet in Hei Long Jiang province. The main reason which caused the differences in yield was the kernels of ear when the number of ear was controlled by adjusting the seeding density. High yield type of DONG 01-4489 had above 35 kernels/ear and 35g/1000 kernels under the four densities of the experiment. So the yield of the line was the highest of 10 cultivars (or lines). One of the main character of high-yield spring whea in HeiLongJiang province should be at least of 35 kernels/ear and 35g/1000 kernels under the different densities. Because of the great influence on the kernels of ear and thousand kernels weight by planting density, so the elite individuals in the segregating generations should be selected under different densities based on the choice of eminent crossing parents during breeding of wheat, under which the genotypes of different responses to densities could be really expressed.By the research of the accumulation of dry matter of the high-yield DONG 01-4489 in different development periods, the high-yield type of spring wheat in Heilongjiang province shouldbe of the characters as follows: higher biomass before flowering, above 3g in the dry weight of a single stem and ear; a quicker accumulative rate of ear after flowering, a longer duration of kernel filling of about 25—30d, a higher rate of kernal filling; contiuece drifting of dry matter in stem to ear before ripeness to increase yield further; A shorter period of late dough should be demonded in about 5d according to the natural condition of Heilongjiang province. It was able to ensure escaping the more rain and high temperatue in latter growing period of wheat and maturing safely; The biomass of high-yield cultivars or lines during harvest should be 5g or more in a single stem and ear.
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